Posted by Anonymous on Tuesday, June 19, 2012 at 4:35pm.
the lenght of a species of fish is normally distributed with a mean of 24.3 inches and a standard deviation of 1.8 inches. What is the lenght that is exceeded by 30%of these fish

statistics  bobpursley, Tuesday, June 19, 2012 at 6:21pm
http://davidmlane.com/hyperstat/z_table.html

statistics  MathGuru, Tuesday, June 19, 2012 at 6:23pm
You will have to determine zscore (use a ztable with the information you are given), then use the zscore formula to find x (the length).
Zscore formula is this:
z = (x  mean)/sd
mean = 24.3
sd = 1.8
Once you find the zscore in the table, substitute the zscore and the data above into the formula and solve for x.
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